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Stephen Day

Gas Safe Engineer at iHeat

Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling, and renewable energy industry, specialising in boiler installations, air conditioning, and heat pump systems.

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About Stephen Day

Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling and renewable energy industry.

Throughout his career, Stephen has designed, installed and maintained thousands of systems across homes and businesses in the UK. His background on the tools, combined with his directorship role at iHeat, gives him a rare understanding of both the technical and operational sides of the industry.

He has helped to secure Which? Trusted Trader accreditation all with a focus on delivering great service and long-term value for customers. He also writes for the iHeat blog, sharing practical advice and explaining heating topics in plain, helpful language.

Stephen continues to stay up to date with the latest heating technologies, building regulations and low-carbon innovations.

Gas Safe ID: 5910722

Expertise

  • Boiler systems and installation
  • Heat pumps and hybrid heating systems
  • Gas safety and compliance
  • System design
  • Renewable and low-carbon technologies
  • Technical training


Articles by Stephen Day are reviewed by iHeat’s technical team for accuracy and reliability.

Stephen Day's latest articles

Boiler Brands To Avoid - Worst Boilers in 2026

16th January, 2026 Guides

Boiler Brands To Avoid - Worst...

This guide covers the boiler brands most often flagged as higher risk, plus the key warnin...

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Combining Air Source Heat Pumps And Solar Panels: UK Guide

16th January, 2026 Advice

Combining Air Source Heat Pump...

Most homes can lower heating costs by combining air source heat pumps with solar panels.

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Best Combi Boiler 2026

15th January, 2026 Guides

Best Combi Boiler 2026

Here’s a quick roundup of the best combi boilers for 2026.

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Best Compact Combi Boilers For Small Homes

14th January, 2026 Guides

Best Compact Combi Boilers For...

A simple guide to the smallest combi boilers that fit inside kitchen cupboards and tight s...

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Best Boilers for Big Families (Large 5 Bedroom House)

14th January, 2026 Guides

Best Boilers for Big Families...

For most large UK homes and big families, a system boiler with a correctly sized hot water...

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Best Heat-Only (Conventional) Boilers in 2026

14th January, 2026 Guides

Best Heat-Only (Conventional)...

The best heat-only (conventional) boilers in 2026 are the models that reliably power a hot...

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Best System Boilers for 2026

14th January, 2026 Guides

Best System Boilers for 2026

A quick shortlist of the best system boilers in the UK for reliable heating and strong hot...

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Best Electric Boilers 2026

12th January, 2026 Guides

Best Electric Boilers 2026

The best electric boilers in 2026 include models from Electric Heating Company, Heatrae Sa...

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Best Boiler Brands in the UK (2026) Top Manufacturers

09th January, 2026 Guides

Best Boiler Brands in the UK (...

The best boiler brands for UK homes in 2026 are Worcester Bosch, Vaillant, Viessmann, Alph...

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How to Link a Wood Burner to Your Central Heating (UK Guide)

06th January, 2026 Guides

How to Link a Wood Burner to Y...

Connecting a wood burner to your central heating system can be an efficient way to heat yo...

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AI Technology in Home Heating: The Future of Efficiency?

06th January, 2026 Guides

AI Technology in Home Heating:...

Artificial Intelligence (AI) is changing home heating by introducing smarter, more efficie...

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Boiler Repair Birmingham

05th January, 2026 Guides

Boiler Repair Birmingham

Boiler repairs are a critical aspect of maintaining a household's functionality and safety...

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